Alpine72, did you have full filtering glacier glasses (Euro cat. 4) or like me, you used the more versatile mountaineering and driving glasses (Euro cat. 3) ?
I was not expecting that much snow on Aconcagua and with the sunny weather, the altitude and the latitude, my cat. 3 glasses were truly not enough. Pro : I have dark eyes.
Anyway I felt insolation stiking through the openning of my baclava (around the eyes). At one point, on the summit I wanted to take a picture but when looking at the view through my camera, my vision was totally blurry...
Diamox ? have never used, thinking it was more something for emergency cases and to help going downward in case of AMS, HAPE and HACE.